If I read it correctly, layer.plot is supposed to set the active dataset. I recall that this was not implemented earlier--is there a patch, or does it work in 6.1?

Thanks,

It isn't yet implemented for 6.1. I have added comments to the original item in our tracking database.

In the meantime, you can use substitution notation. %(1,@D) will return the dataset name of the first dataset in the layer and %C is the string variable that stores the active dataset name. You can then use the following notation:

%C=%(2,@D); //set the second dataset in the layer as the active dataset